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-3(f+5)=9
We move all terms to the left:
-3(f+5)-(9)=0
We multiply parentheses
-3f-15-9=0
We add all the numbers together, and all the variables
-3f-24=0
We move all terms containing f to the left, all other terms to the right
-3f=24
f=24/-3
f=-8
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